Fix HEOS discovery could result in multiple config entries (#22903)

* Prevent duplicate entries from discovery

* Update reqs files

* Prevent duplicate entries from discovery

tests/components/heos/conftest.py

@@ -103,3 +103,21 @@ def input_sources_fixture() -> Sequence[InputSource]:
 def dispatcher_fixture() -> Dispatcher:
     """Create a dispatcher for testing."""
     return Dispatcher()
+
+
+@pytest.fixture(name="discovery_data")
+def discovery_data_fixture() -> dict:
+    """Return mock discovery data for testing."""
+    return {
+        'host': '127.0.0.1',
+        'manufacturer': 'Denon',
+        'model_name': 'HEOS Drive',
+        'model_number': 'DWSA-10 4.0',
+        'name': 'Office',
+        'port': 60006,
+        'serial': None,
+        'ssdp_description':
+            'http://127.0.0.1:60006/upnp/desc/aios_device/aios_device.xml',
+        'udn': 'uuid:e61de70c-2250-1c22-0080-0005cdf512be',
+        'upnp_device_type': 'urn:schemas-denon-com:device:AiosDevice:1'
+    }